Pump plunger



Marh 27, 1928. v

1 J. E. PHELPS PUMP PLUNGER Filed A112. 23. 1927 Patented Mar. 27, 1928.

UNITED STATES JAMES E. PHELPS,

e or meson, Iowa.

PUMP. PLUNGER.

Application filed August 23, 1927. Serial no. 214,876.

This invention relates to new and useful improvements in plunger-s ifor pumps of the reciprocating piston type and aims to provide a highly novel, simple and efiicient-ly operating plunger that is so constructed as to admit air through the center thereof during the upstroke, and that will close the air through the plun er on the down stroke so that the full st-ro e of the plunger will be employed in forcingthe' air from :the pump cylinder. Furthermore, by reason of a plunger of this character, the usual cylinder engaging leather is not disturbed and at all times has a snug fit upon the interior of the cylinder so that there will be no sibility of the air passing between the leather and the cylinder. Furthermore, by reason of a plunger of this character there will be no vibration of the leather which would otherwise quickly result in the breaking and deterioration of theisame.

In further carrying out the present invention there is provided a plunger construction that may be rapidly associated with the piston rod of an ordinary hand pump without requiring any changes in the pump other than the removal of its plunger.

The invention further aims to provide a pump plunger that may be entirely taken apart for cleaning, repair, or renewal purposes.

In the drawings wherein like reference characters indicate corresponding parts in both of the views thereof:

Figure 1 is a detail section through my improved plunger as actually associated with a plunger rod, and operable within. a pump cylinder, and i Figure 2 is a section taken through the plunger rod directly above the plunger for disclosing the same in top plan.

Now having particular reference to the drawings, A designates the cylinder of an ordinary hand pump, while B designates theplunger or piston rod thereof. The piston rods of practically all of the conventional types of hand pumps are constructed at their lower ends with a threaded pin 6 as disclosed in Figure 1. My invention per se consists of a circular plate 5, the edge of which is beveled as at 6 and which is formed at its top surface with a polygonal shaped boss 7 to permit turning of the same. Upon the under side of this plate there is formed a depending externally threaded collar 8, while formed centrally through the plate 5 pos and said boss 7 is a plunger TI'Od open' 9. Furthermore, said plate 5 isformed at iame'trically opposed points with diagonally extending circular air openings 10-10 through which air will 'pass through the upper end of the cylinder A during the down stroke of the plunger in a manner presently to be apparent;

The plunger further consists of a metallic bowl -11,the side wall of which is internally threaded so that the same may be threaded upon the'collar "8 of said plate 5 as clearly indicated in Figure 1. Prior to the screwing of this bowl 11 upon said collar the inner edge of a conventional pump leather 12 is arranged beneath the plate 5 outwardly of the said collar 8 after which this leather is arranged upwardly'upon the beveled surface of the plate and thence downwardly to provide a skirt for contacting the inner surface of the cylinder A as clearly disclosed. Obviously then the screwing of the bowl 11 upon the collar 8 will result in the rigid attachment of the leather to the plunger. By reason of the leather engaging the bevel surface of the plate 5 the tendency of the same will be to expand outwardly to closely hug the interior of the cylinder so that there will be no liability of air passing between the leather and said cylinder.

The bottom wall of the bowl 11 is formed centrally with a conical air intake opening 13, while screwed upon the pin Z; at the lower end of the plunger rod B is a conical valve 14 adapted to tightly fit at its lower end within the conical opening 13 of the cup 11 at the initial movement on the down stroke of the rod B for obviously closing the passage through the plunger so that the air trapped within the cylinder A thereb'eneath will be ejected therefrom during the further down stroke of said rod B which will obvi ously carry the plunger also downwardly. Immediately upon the upstroke the rod B. will be moved slightly upwardly'through the. plunger for opening the passage therethrough to permit the air to pass downwardly through the opening 10-1O and then the opening of the plate 5 and bowl 11 respectively.

vided a highly novel, simple, and extremely elficient pump plunger that is Well adapted for all the purposes heretofore designated, even though I have herein shown and described the invention as consisting of cer- It will therefore be seen that I have protain detail structural elements, it is nevertheless to be understood that some changes may be made therein without affecting the spirit and scope of the appended claim.

Having thus described the invention, what I claim as new and desire to secure by Letters Patent is In a plunger for pumps including a cylinder, and a plunger rod, a circular plate of a diameter slightly less than the internal diameter of the cylinder within which it is to operate, the periphery of said plate being beveled, a collar depending from the bottom surface of said plate within the periphery thereof, a bowl adapted to be detachably rigidly associated with said collar, a leather adapted to be arranged at its, inner edge between the upper end of the bowl and the bottom surface of said plate, saidleather thence extended upwardly along the beveled edge of the plate and downwardly for having close engagement with the interior of the cylinder, the bottom wall of said bowl being provided with an' air exhausting opening while said plate is provided with air intake openings terminating at their inner en'ds within said collar, said plate being further provided with a central opening through which the plunger rod is slidable, and a valve head arranged upon the lower end of the rod and adapted to engage Within the opening of the bowl during the downstroke of said plunger for preventing the air from passing therethrough, said valve head adapted to be raised from the bowl opening during the upstroke oi the plunger to permit the air to pass through the plunger into' the bottom of the cylinder.

In testimony whereof I aflix my signature.

' JAMES E. PHELPS. 

